Hyperpyrexia is defined as a temperature greater than:

• A. temp >106 F
• B. temp >99 F
• C. temp <95 F
• D. temp 98.6 F

Answer: (A)

Hyperpyrexia represents an extreme, dangerous elevation in body temperature. It goes well beyond a typical fever and signals a medical emergency. Normal body temperature is about 98.6°F, and fever is usually considered when temperatures rise above roughly 100.4°F. Hyperpyrexia specifically denotes temperatures above 106°F (41.1°C), at which the risk of brain injury, seizures, and multiorgan dysfunction increases sharply. This is why the threshold is set around 106°F—to indicate a level where rapid cooling and urgent treatment of the underlying cause are essential.

The other values describe milder fever, normal temperature, or hypothermia, which do not meet the criteria for hyperpyrexia.